HTTP 400 when POSTing canned response to Genesys Cloud Conversations API via Terraform provisioner

We are attempting to automate the injection of a pre-approved canned response into an active chat session using the Conversations API. The intention is to trigger this via a Terraform local-exec provisioner after a specific interaction state is detected, effectively bridging our IaC workflow with real-time agent assistance.

The endpoint in question is /api/v2/conversations/chats/{conversationId}/messages. We are sending a POST request with the following JSON payload:

{
 "type": "text",
 "text": "Thank you for contacting support."
}

The authorization header is populated with a valid OAuth Bearer token, and the Content-Type is set to application/json. However, the response consistently returns a 400 Bad Request with the message: “Invalid message type or missing required fields.”

I have verified the conversationId is valid and the session is active. The documentation suggests that for chat messages, the type should be text, which is what we are providing. I am wondering if there is an additional schema requirement for canned responses specifically, or if the API expects a different structure when invoked from an external automation script rather than the agent desktop UI.

The Terraform resource block looks like this:

resource "null_resource" "send_canned" {
 provisioner "local-exec" {
 command = "curl -X POST https://{{env}}.mygenesys.cloud/api/v2/conversations/chats/${var.conv_id}/messages -H 'Authorization: Bearer ${var.token}' -H 'Content-Type: application/json' -d '{\"type\":\"text\",\"text\":\"Thank you\"}'"
 }
}

The drift in state is minimal, but the API rejection is immediate. Any insights on the correct payload structure for this endpoint?

terraform isn’t built for real-time API calls. you’ll hit rate limits and timeout issues. use a simple c# console app or azure function with the .NET SDK instead. here’s the code snippet that actually works:

var api = new ConversationsApi(platformClient);
await api.PostConversationsChatsMessages(conversationId, new ChatMessage { Text = "Approved response" });

don’t force IaC to handle runtime events.